Forget making hearts with your hands – that’s so 2012! Triangles and quadrilaterals are the way to go.

This is quicker than getting whiteboards out, can be used as a memory aid and keeps mischievious fingers busy.

Getting started
The basic L shapes (my assistant had been busy with felt tip pens before being photographed).

Isosceles Triangle

Index figures and thumbs together.

Equilateral Triangle

Index figures together, thumbs overlapping.

Rectangle

Index fingers and thumbs joined at 90 degrees.

Parallelogram

As for the rectangle, but opposite angles equal (as opposed to 90 degrees).

Square

Thumbs part way down index fingers at 90 degrees.

Rhombus

As for the square, but opposite angles equal (rather than 90 degrees).

Arrowhead Kite

Index fingers together, thumbs together, all pointing upwards.

Kite

Index fingers pointing up, thumbs pointing down.