[bendykstra]

The article fails to mention that the genie lamp configuration relies on additional "point weights," which are blocks of zero height and width and non-zero weight. In the figure, those are represented by arrows.

http://www.maa.org/sites/default/files/pdf/upload_library/22...

[thenewwazoo]

I'd really like to buy some of those zero-height, zero-width, nonzero-mass blocks!

[SiVal]

You'll have to wait for the Singularity when they go on sale.