Gifts for Engineers: Desk Toys That Show the Physics

Engineers are hard to buy for, and not because they have everything. It is because they can tell, instantly, when something is badly made — and because the gadgets marketed "for engineers" are usually mugs with jokes on them. What an engineer actually enjoys is an object where the mechanism is the point: something they can watch, take apart in their head and explain to you at length.

The test: will they pick it up during a long call and start explaining how it works?

Desk toys that show the physics

• A chaos double pendulum. Two linked arms on bearings: spin it and the second arm swings off the first in a pattern that is predictable for a moment, then never repeats. A double pendulum is one of the simplest physical systems that shows chaotic motion — tiny differences in the starting push lead to completely different paths. Any engineer who has met chaos theory will be delighted to own one.
• A Newton's cradle. Conservation of momentum and energy, clicking away on the desk. It is the classic for a reason, and the explanation is more subtle than most people think. How does a Newton's cradle work?
• A gear-and-chain fidget. Two metal gears joined by a real roller chain: a working drivetrain in the palm of the hand. The mechanical engineer's fidget.
• A precision spinning top. Machined metal, low friction, spins for minutes. Gyroscopic stability, made visible. How to spin a spinning top.
• A flip fidget. A metal pyramid that spins, tilts and flips before landing flat — a nice puzzle in centre of mass and angular momentum.

Gifts for mechanical engineers

Choose anything with visible moving parts. The gear-and-chain fidget is the obvious pick, and an infinity cube — eight blocks on a chain of hinges that fold endlessly — is a tidy little lesson in linkages. How to use an infinity cube.

Gifts for civil engineers

Civil engineers think in loads, routes and systems. A wooden maze strategy game, in which players race across a board while placing walls to lengthen each other's path, is essentially a route-planning problem with an opponent. A pocket compass suits anyone who has spent time on a site or a survey — see how to use a compass.

Gifts for electrical and software engineers

Their work is invisible, so give them something physical and analog for a change. The double pendulum is a favourite here — it is the kind of system they may have simulated, now in their hand. A chess set suits the systems thinker too; see gifts for chess players.

Gifts for engineering students

Students live at a desk for years. A small, solid desk toy that survives being thrown in a bag is ideal: the spinning top, the flip fidget or the gear-and-chain fidget all fit in a pocket.

Engineering gifts by budget of desk space

For a broader list, see desk toys for adults and executive desk toys.