Solar Communicator

We are at a point with technology where we can "see" large planet objects orbiting near stars. Within a few decades we'll be able to see smaller objects, perhaps moon-sized objects. Our view won't be very detailed but we'll be able to notice shapes and shadows.

Let's assume beings on other planets have this capability now and could in theory point their telescopes at our star.

What if we set up a beacon in our solar system capable of presenting visible messages to other systems? Imagine a simple deployable robot that can inflate and deflate itself based on incoming data. Now connect 1 million of them in a long line and set them up on a communication chain so they all do the same thing. Now set up 2 more lines at perpendicular angles (X, Y, Z) so we have a large 3D crosshairs object in our system which, by tandem inflation and deflation, becomes "more visible" and "less visible", sending morse code, binary, or just an alternating on/off signal like an ocean buoy.

The objects could be reflective, or lens-based, radioactive (a good use of our nuclear waste?) or be oriented in some other way to be highly visible from other systems.

Are we looking for these kinds of beacons in other solar systems? I wonder what we would do if we found one?