Here's another attempt while keeping the lines straight. This is a composite of two images.

Interestingly, though you can't see it here, the pyramid is actually a four pointed star (with eight sides) at its base, not a square. This peculiar property was first discovered in 1940 by a British air-force pilot who noticed different shading on one of the sides. You can see a photograph of this effect here.

Time to go inside.